Answer:
2
Step-by-step explanation: 0 = 2x - 4
2x = 4
x = 2
Answer:
Step-by-step explanation:
point sorry
a.

is a proper joint density function if, over its support,
is non-negative and the integral of
is 1. The first condition is easily met as long as
. To meet the second condition, we require

b. Find the marginal joint density of
and
by integrating the joint density with respect to
:


Then


c. This probability can be found by simply integrating the joint density:


Answer:-80
Step-by-step explanation:f(x)=2*2+4*-10
Answer: a. $128.125
Step-by-step explanation:
The standard error of the mean is given by :
, where
= population standard deviation , n= sample size.
Given: 
n= 256
Then, the standard error of the mean:-

Hence, option a. is correct.